The STIHL 41826400138 is a genuine OEM fuel tank cap designed for a wide range of STIHL outdoor power equipment. This essential component ensures a secure seal for the fuel tank, preventing leaks and maintaining proper fuel system pressure. It is a direct replacement part, ensuring compatibility and optimal performance for models including FS 90, FS 100, FS 130, KM 90, KM 100, KM 130, and others. Made from durable materials, this cap is built to withstand the demanding conditions of outdoor use.